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HD 1424


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The period distribution of unevolved close binary systems
Period distributions have been examined for various spectral types ofabout 600 (eclipsing and spectroscopic) close binaries, which are likelyto be substantially unevolved. The comparison with the previouscorresponding analyses of extensive (but heterogeneous) binary samplesallows a clarification of the extent of the evolutionary andobservational selection effects. Remarkably, this analysis reveals agreat deficiency of short period binaries (with periods corresponding tocase A mass transfer) in the whole spectral range. For the late spectraltypes, this result may be connected with postformation angular momentumloss caused by stellar wind magnetic braking; at least for the late Band A spectral range, a ready interpretation of this finding is thatclose binaries of corresponding periods and spectral types are rarelyformed.

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Osservazione e dati astrometrici

Costellazione:Fenice
Ascensione retta:00h18m09.99s
Declinazione:-52°58'04.8"
Magnitudine apparente:9.294
Moto proprio RA:10.7
Moto proprio Dec:-189.8
B-T magnitude:10.092
V-T magnitude:9.36

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 1424
TYCHO-2 2000TYC 8465-246-1
USNO-A2.0USNO-A2 0300-00085877
HIPHIP 1457

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